Bruce T.suggests sealing the back of the flyweel nut for auto use in case
the rear seal leaks and starts getting oil on your clutch. It should not
make any difference in our application, but do use locktite.

Ron Freier

Actually there have been rare cases where there has been seepage through the tapered fit and onto the flywheel. It's more the
result Japanese engineering overkill.
Bruce

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